FreeCiv - Freeciv is an open-source, turn-based strategy game based on Civilization II.
TripleA - TripleA is a free (under GPL) turn based strategy game based on Axis & Allies board game.
Freeciv for Android - Port of Freeciv to Android - similar to Civilization series.
ThumbZilla - Awesome thumb stomping and kicking action game.
Widelands - Widelands is a free, open source real-time strategy game with singleplayer campaigns and a...
Warlight - Warzone is a customizable Risk-like strategy game where you compete with your friends to conquer the world.